A hot-air furnace for a grain drying tower

Abstract

The utility model provides a kind of grain drying tower hot blast furnace, belong to hot blast furnace technical field;Including hot blast furnace body, the heating mouth of hot blast furnace body is equipped with combustion engine, further include: preheating mechanism, the preheating mechanism includes shell, and the opposite side of shell short side is communicated with air inlet pipe and air outlet pipe.The utility model is equipped with shell and heat exchange tube, when using, the flue gas discharged from hot blast furnace body flue gas outlet passes pipeline, air inlet cavity, heat exchange tube, air outlet cavity in proper order, and is discharged from the flue gas outlet of air outlet cover, after flue gas passes heat exchange tube, the heat in flue gas will be transferred to heat exchange tube, subsequently air enters from air inlet pipe, after air and heat exchange tube contact, the heat on heat exchange tube will be transferred to air, so that air is preheated, preheated air enters hot blast furnace body interior and is heated again, the heat required for air heating to same temperature is smaller, and the time spent is shorter, to improve heat energy utilization.

Description

Technical Field

[0001] This utility model relates to the field of hot air furnace technology, and in particular to a hot air furnace for a grain drying tower. Background Technology

[0002] The hot air furnace in a grain drying tower is a key heating device in the grain drying tower system. Its core function is to heat air to a specific temperature and then deliver the heated hot air into the drying tower. Through full contact with the wet grain, the moisture in the grain is removed, thereby achieving the drying process and ensuring the quality of grain storage and subsequent processing. The hot air furnace mainly consists of a hot air furnace and a burner. During operation, the burner is installed at the heating port of the hot air furnace. The flame emitted by the burner enters the heater inside the hot air furnace from the heating port, and the flue gas is discharged from the flue gas outlet. Air enters the hot air furnace from the air inlet and comes into contact with the heater to heat the air. Subsequently, the air is discharged from the air outlet of the hot air furnace.

[0003] After the flue gas is discharged from the hot air furnace, it still contains a large amount of heat energy. Directly discharging the flue gas would lead to the waste of this heat energy, and the utilization rate of heat energy needs to be improved. Therefore, this application provides a hot air furnace for a grain drying tower to meet the needs. Utility Model Content

[0004] This utility model provides a hot air furnace for a grain drying tower to solve the problem of insufficient utilization of thermal energy.

[0005] To solve the above-mentioned technical problems, this utility model provides the following technical solution: A hot air furnace for a grain drying tower includes a hot air furnace body, a burner installed at the heating port of the hot air furnace body, and further includes: The preheating mechanism includes a shell, with an air inlet pipe and an air outlet pipe connected to opposite sides of the short side of the shell. The air outlet pipe is installed at the air inlet end of the hot air furnace body. An air inlet hood and an air outlet hood are fixed to opposite sides of the long side of the shell, respectively. The air inlet hood is connected to the flue gas outlet of the hot air furnace body through a pipe. An air inlet cavity is formed between the inner wall of the air inlet hood and the outer wall of the shell. An air outlet cavity is formed between the inner wall of the air outlet hood and the outer wall of the shell. A plurality of heat exchange tubes are connected to the inner wall of the shell, and the two ends of the heat exchange tubes are connected to the air inlet cavity and the air outlet cavity, respectively. During use, the flue gas discharged from the flue gas outlet of the hot blast furnace body passes through the pipe, the air inlet cavity, the heat exchange tube, and the air outlet cavity in sequence, and is discharged from the exhaust port of the air outlet hood. Air enters from the air inlet pipe, is heated by the heat exchange tube, and then enters the hot blast furnace body through the air outlet pipe.

[0006] Preferably, the heat exchange tube consists of a horizontal section and an expansion section, with the horizontal section communicating with the air inlet cavity and the expansion section communicating with the air outlet cavity.

[0007] Preferably, the inner wall of the expansion portion is fitted with a plurality of conical guide blocks, the tips of which face the horizontal portion.

[0008] Preferably, the tapered guide block has a groove at one end facing the expansion portion, and a plurality of L-shaped connecting rods are fixed on the inner wall of the groove, with the bottom of the L-shaped connecting rod prototype fixed to the inner wall of the expansion portion.

[0009] Preferably, the surface of the expansion portion is provided with a plurality of recesses, which are located between adjacent conical guide blocks.

[0010] Preferably, a plurality of heat dissipation fins are fixedly fitted onto the surfaces of both the horizontal portion and the expansion portion.

[0011] Preferably, the spacing between the plurality of heat dissipation fins on the surface of the horizontal portion is smaller than the spacing between the plurality of heat dissipation fins on the surface of the expansion portion.

[0012] Preferably, several of the heat exchange tubes are staggered.

[0013] Compared with the prior art, this utility model has at least the following beneficial effects: In the above scheme, by setting up a shell and heat exchange tubes, during use, the flue gas discharged from the flue gas outlet of the hot blast stove body passes through the pipe, the air inlet cavity, the heat exchange tubes, and the air outlet cavity in sequence, and is discharged from the exhaust port of the air outlet hood. After the flue gas passes through the heat exchange tubes, the heat in the flue gas will be transferred to the heat exchange tubes. Then, the air enters from the air inlet pipe. After the air comes into contact with the heat exchange tubes, the heat on the heat exchange tubes will be transferred to the air, so that the air is preheated. The preheated air enters the interior of the hot blast stove body and is heated again. The air requires less heat and takes less time to heat to the same temperature, thereby improving the thermal energy utilization rate.

[0014] By incorporating a horizontal section and an expansion section, the flue gas enters the horizontal section at a higher temperature, resulting in high heat transfer efficiency and significant heat absorption. When the flue gas enters the expansion section, its temperature decreases, and the heat transfer efficiency also decreases. At this point, the inner diameter of the expansion section increases, slowing down the flow rate of the flue gas and increasing the contact time between the flue gas and the inner wall of the expansion section. This ensures that the heat from the flue gas is fully exchanged with the inner wall of the expansion section, thereby further improving the thermal energy utilization rate.

[0015] By setting a conical guide block, the flue gas located in the middle of the expansion section is far from the inner wall of the expansion section, which will result in low heat exchange efficiency between the flue gas in this part and the inner wall of the expansion section. At this time, the flue gas is guided to the inner wall of the expansion section by the conical guide block, so that the heat energy of the flue gas is fully absorbed, thereby further improving the utilization rate of heat energy.

[0016] By setting the recessed part, the area of ​​the inner wall of the expansion part is increased, so that the flue gas can come into more full contact with the inner wall of the expansion part, thereby improving the heat exchange rate of the flue gas. Secondly, the gas guided to the inner wall of the expansion part by the conical guide block also comes into contact with the recessed part at the expansion part, and the contact area between the flue gas and the recessed part is larger, thereby improving the thermal energy utilization rate of the flue gas.

[0017] By setting heat dissipation fins, the contact area between the expansion section and the horizontal section and the air is increased. This allows the air to absorb more heat as it passes through the horizontal section, expansion section, and heat dissipation fins, thereby improving the preheating effect of the air. Secondly, since the flue gas in the horizontal section is hotter, there is more heat energy in the horizontal section. Therefore, the spacing of the heat dissipation fins in the horizontal section is smaller, allowing the air to absorb more heat energy. Attached Figure Description

[0018] Figure 1 This is a schematic diagram of the overall structure of this utility model; Figure 2 This is a schematic diagram of the side structure of the hot blast stove body of this utility model; Figure 3 This is a schematic diagram of the shell structure of this utility model; Figure 4 This is a cross-sectional view of the housing of this utility model; Figure 5 This is a cross-sectional view of the heat exchange tube of this utility model.

[0019] In the diagram: 1. Hot air furnace body; 2. Preheating mechanism; 3. Shell; 4. Air inlet hood; 5. Air outlet hood; 6. Heat exchange tube; 7. Air inlet pipe; 8. Air outlet pipe; 9. Horizontal section; 10. Expansion section; 11. Recessed section; 12. Conical guide block; 13. Heat dissipation fins; 14. Burner. Detailed Implementation

[0020] The following is a detailed description of a hot air furnace for a grain drying tower provided by this utility model, in conjunction with the accompanying drawings and specific embodiments. It should be noted that, to make the embodiments more detailed, the following embodiments are the best and preferred embodiments; those skilled in the art can also use other alternative methods to implement some known technologies; and the accompanying drawings are only for more specific description of the embodiments and are not intended to specifically limit this utility model.

[0021] like Figures 1-5 As shown, an embodiment of this utility model provides a hot air furnace for a grain drying tower, including a hot air furnace body 1, a burner 14 installed at the heating port of the hot air furnace body 1, and further including: The preheating mechanism 2 includes a shell 3. An air inlet pipe 7 and an air outlet pipe 8 are connected to opposite sides of the short side of the shell 3. The air outlet pipe 8 is installed at the air inlet end of the hot air furnace body 1. An air inlet hood 4 and an air outlet hood 5 are fixed to opposite sides of the long side of the shell 3. The air inlet hood 4 is connected to the flue gas outlet of the hot air furnace body 1 through a pipe. An air inlet cavity is formed between the inner wall of the air inlet hood 4 and the outer wall of the shell 3. An air outlet cavity is formed between the inner wall of the air outlet hood 5 and the outer wall of the shell 3. Several heat exchange pipes 6 are connected to the inner wall of the shell 3. The two ends of the heat exchange pipes 6 are connected to the air inlet cavity and the air outlet cavity, respectively. In use, the flue gas discharged from the flue gas outlet of the hot air furnace body 1 passes sequentially through the pipe, the air inlet cavity, the heat exchange tube 6, and the air outlet cavity, and is discharged from the exhaust port of the air outlet hood 5. Air enters from the air inlet pipe 7, is heated by the heat exchange tube 6, and then enters the hot air furnace body 1 through the air outlet pipe 8. The hot air furnace body 1 provides hot air for grain drying, and the burner 14 provides a heat source for heating the hot air furnace body 1. The shell 3 forms a preheating space. The air inlet pipe 7 supplies air in, and the air outlet pipe 8 delivers the preheated air to the hot air furnace body 1. The air inlet hood 4 and the air outlet hood 5 guide the flue gas in and out, respectively. The air inlet cavity and the air outlet cavity realize the diversion and convergence of the flue gas. The heat exchange tube 6 transfers the heat of the flue gas, so that the air is preheated in the shell 3. The preheated air entering the hot air furnace body 1 can reduce the energy consumption and time of reheating and improve the thermal energy utilization rate.

[0022] like Figure 5 As shown in this embodiment, the heat exchange tube 6 consists of a horizontal section 9 and an expansion section 10. The horizontal section 9 is connected to the inlet cavity, and the expansion section 10 is connected to the outlet cavity. The horizontal section 9 receives high-temperature flue gas and absorbs the heat of the flue gas by utilizing the high heat exchange efficiency at high temperature. The inner diameter of the expansion section 10 is increased, which slows down the flow rate of the low-temperature flue gas and prolongs the contact time between the flue gas and the inner wall of the expansion section 10, ensuring that the heat of the flue gas is fully transferred and further improving the thermal energy utilization rate.

[0023] like Figure 5 As shown in this embodiment, a plurality of conical guide blocks 12 are installed on the inner wall of the expansion section 10. The tips of the conical guide blocks 12 face the horizontal section 9. The conical guide blocks 12 guide the flue gas in the middle of the expansion section 10 to the inner wall, so as to avoid insufficient heat exchange due to the distance of the flue gas in the middle from the inner wall, so that the heat of the flue gas is fully absorbed and the heat energy utilization rate is improved.

[0024] like Figure 5 As shown in this embodiment, the tapered guide block 12 has a groove at one end facing the expansion portion 10. Several L-shaped connecting rods are fixed to the inner wall of the groove. The bottom of the vertical part of the L-shaped connecting rod is fixed to the inner wall of the expansion portion 10. The L-shaped connecting rod fixes the tapered guide block 12 to the inner wall of the expansion portion 10, ensuring the stability of the guide block position. The groove provides installation space for the connecting rod, avoiding interference with the flue gas flow and ensuring the flue gas guiding effect.

[0025] like Figure 5 As shown in this embodiment, the surface of the expansion portion 10 is provided with a plurality of recesses 11. The recesses 11 are located between adjacent conical guide blocks 12. The recesses 11 increase the inner wall area of ​​the expansion portion 10, so that the flue gas can come into full contact with the inner wall. In conjunction with the conical guide blocks 12, the flue gas guided to the inner wall can come into full contact with the recesses 11, thereby further improving the heat exchange efficiency of the flue gas.

[0026] like Figure 5 As shown in this embodiment, several heat dissipation fins 13 are fixedly sleeved on the surfaces of the horizontal part 9 and the expansion part 10. The heat dissipation fins 13 increase the contact area between the horizontal part 9 and the expansion part 10 and the air, so that the air can absorb more heat, improve the air preheating effect, and save energy for the subsequent heating of the hot air furnace body 1.

[0027] like Figure 5 As shown in this embodiment, the spacing between several heat dissipation fins 13 on the surface of the horizontal part 9 is smaller than the spacing between several heat dissipation fins 13 on the surface of the expansion part 10. The flue gas temperature is high and the heat is sufficient at the horizontal part 9, so the denser heat dissipation fins 13 can fully transfer the heat. The flue gas temperature is lower at the expansion part 10, so the sparser heat dissipation fins 13 can reduce the airflow resistance. At the same time, it adapts to the heat exchange requirements of this area and ensures the overall preheating efficiency.

[0028] like Figure 4 As shown in this embodiment, several heat exchange tubes 6 are staggered. The staggered arrangement of the heat exchange tubes 6 can prevent the air from forming dead air zones inside the shell 3, so that the air can fully contact all the heat exchange tubes 6, ensuring that the air is heated evenly, improving the preheating effect, and at the same time improving the utilization rate of the internal space of the shell 3.

[0029] Working principle: When the hot blast stove is running, the burner 14 works at the heating port of the hot blast stove body 1. The burner 14 heats the heater inside the hot blast stove body 1. The flue gas is discharged from the flue gas outlet of the hot blast stove body 1 and enters the air inlet hood 4 of the preheating mechanism 2 through the pipeline. After the flue gas enters the air inlet hood 4, it flows into the air inlet cavity between the inner wall of the air inlet hood 4 and the outer wall of the shell 3, and then disperses into several staggered heat exchange tubes 6 connected to the inner wall of the shell 3. The flue gas first flows through the horizontal section 9, and the heat is transferred to the horizontal section 9 and the heat dissipation fins 13. Then the flue gas enters the expansion section 10. The inner diameter of the expansion section 10 increases, which slows down the flue gas flow rate. The flue gas fully contacts the inner wall of the expansion section 10 and the recessed section 11. At the same time, the conical guide block 12 guides the flue gas to the inner wall of the expansion section 10, further improving the heat exchange efficiency. The flue gas that has completed heat exchange flows from the expansion section 10 into the air outlet cavity between the inner wall of the exhaust hood 5 and the outer wall of the housing 3, and is finally discharged from the exhaust port of the exhaust hood 5. At the same time, air enters the interior of the housing 3 from the air inlet pipe 7 on the short side of the housing 3, and comes into contact with the horizontal part 9, the expansion part 10 and the heat dissipation fins 13 on the surface of the heat exchange tube 6, absorbing the heat transferred by them to complete the preheating. The preheated air is discharged from the air outlet pipe 8 on the other short side of the shell 3 and enters the air inlet of the hot air furnace body 1. After being further heated in the hot air furnace body 1, it is used for grain drying.

[0030] The above description is only a preferred embodiment of the present utility model. It should be noted that for those skilled in the art, several improvements and modifications can be made without departing from the principle of the present utility model, and these improvements and modifications should also be considered within the protection scope of the present utility model.

Claims

1. A hot air furnace for a grain drying tower, comprising a hot air furnace body (1), wherein a burner (14) is installed at the heating port of the hot air furnace body (1), characterized in that, Also includes: The preheating mechanism (2) includes a shell (3). The short side of the shell (3) is connected to an air inlet pipe (7) and an air outlet pipe (8). The air outlet pipe (8) is installed at the air inlet end of the hot air furnace body (1). The long side of the shell (3) is fixed with an air inlet hood (4) and an air outlet hood (5). The air inlet hood (4) is connected to the flue gas outlet of the hot air furnace body (1) through a pipe. An air inlet cavity is formed between the inner wall of the air inlet hood (4) and the outer wall of the shell (3). An air outlet cavity is formed between the inner wall of the air outlet hood (5) and the outer wall of the shell (3). A number of heat exchange tubes (6) are connected to the inner wall of the shell (3). The two ends of the heat exchange tubes (6) are connected to the air inlet cavity and the air outlet cavity, respectively. When in use, the flue gas discharged from the flue gas outlet of the hot air furnace body (1) passes through the pipe, the air inlet cavity, the heat exchange tube (6), and the air outlet cavity in sequence, and is discharged from the exhaust port of the air outlet hood (5). Air enters from the air inlet pipe (7), is heated by the heat exchange tube (6), and enters the hot air furnace body (1) through the air outlet pipe (8).

2. The hot air furnace of the grain drying tower according to claim 1, characterized in that, The heat exchange tube (6) consists of a horizontal part (9) and an expansion part (10). The horizontal part (9) is connected to the air inlet cavity, and the expansion part (10) is connected to the air outlet cavity.

3. The hot air furnace of the grain drying tower according to claim 2, characterized in that, The inner wall of the expansion section (10) is equipped with a plurality of conical guide blocks (12), the tips of which face the horizontal section (9).

4. The hot air furnace of the grain drying tower according to claim 3, characterized in that, The tapered guide block (12) has a groove at one end facing the expansion part (10), and several L-shaped connecting rods are fixed on the inner wall of the groove. The bottom of the L-shaped connecting rod prototype is fixed to the inner wall of the expansion part (10).

5. The hot air furnace of the grain drying tower according to claim 3, characterized in that, The surface of the expansion portion (10) is provided with a plurality of recesses (11), which are located between adjacent conical guide blocks (12).

6. The hot air furnace of the grain drying tower according to claim 2, characterized in that, The surfaces of the horizontal part (9) and the expansion part (10) are each fixedly fitted with a number of heat dissipation fins (13).

7. The hot air furnace of the grain drying tower according to claim 6, characterized in that, The spacing between several heat dissipation fins (13) on the surface of the horizontal part (9) is smaller than the spacing between several heat dissipation fins (13) on the surface of the expansion part (10).

8. The hot air furnace of the grain drying tower according to claim 1, characterized in that, Several of the heat exchange tubes (6) are staggered.

Images